High frequency dielectric response of uniaxial relaxors and ferroic materials


The project will study the high frequency ferroelectric response (mainly above 1 MHz) and lattice dynamcs of several relaxor and ferroelectric materials, in order to understand the important microwave range (1GH-100GHz), where relaxation processes at the mesoscale takes place. This is important to understand the conection between macroscopic properties, like permittivity, and the microscopic atomic structure. We will focus in iniaxial relaxor materials like SrBaNb2O6 and similar, but also in ferroelectrics based on BaTiO3 and PbTiO3, because all of them show responses in the 10-100 GHz range, that were not properly studied and understood up to now. The experiences and techniques of our department and the partner organization will complement to cover the broad band multiexperimental approach needed.